ASHRAE Library - makes software too slow

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Hi, I am using openstudio application version: 1.6.0 and openstudio SDK, version: 3.6.1. I load the library from file menu, -> load library. (i use the library that comes with software: openstudioapplication-1.6.0\Resources) when i want to use ASHRAE 90.1 library, the software becomes dramatically too slow. I checked the system performance for my computer and i realized the software only uses one CPU Core. does anyone else has the same problem? and is there any solution for that? Thanks